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Posted to users@tomcat.apache.org by Matías Rojas <ro...@nimbuzz.com> on 2008/10/14 10:35:55 UTC
NIO 100% CPU usage
Hello,
I'm experiencing a problem with NIO in Tomcat, maybe related to this issue:
Selector doesn't block on Selector.select(timeout) (lnx)
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the
same problem?
When in heavy load, CPU usage goes to 100% and the only way to go back to
normal is restarting Tomcat.
Thanks,
Matías
Re: NIO 100% CPU usage
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
in the thread dump, the first line for each thread has nid=0x574
this is the hex value for the kernel thread identifier. transform this
into a decimal value,
if you do a top (and show threads, each thread will have a PID) that pid
corresponds to nid
same thing if you do ps, you can get LWP id, and that corresponds to the nid
Filip
Ronald Klop wrote:
> Filip,
>
> How do your top or ps commands relate to threads in the thread dump?
> Are there shared ids or shared names in there?
>
> I'm searching for this for some time, so am really interested in what
> you mean.
>
> Ronald.
>
> Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List
> <us...@tomcat.apache.org>:
>
> Subject: Re: NIO 100% CPU usage
> Date: Wed Oct 15 20:22:43 CEST 2008
> From: Filip Hanik - Dev Lists <de...@hanik.com>
>
> ok, when you reproduce it, you don't really need a profiler,
> you can do a top with threads on, or a ps -efL, and from those,
> you can look into a thread dump
>
> I've never been able to reproduce the issue, so if you have a
> system, or if you want to work with me, ping me offline at fhanik
> at apache dot org
>
> Filip
>
>
> Matías Rojas wrote:
> > It's 6.0.18
> >
> > -----Original Message-----
> > From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] >
> Sent: miércoles, 15 de octubre de 2008 07:25 p.m.
> > To: Tomcat Users List
> > Subject: Re: NIO 100% CPU usage
> >
> > what version of tomcat are you using?
> >
> > Filip
> >
> > Matías Rojas wrote:
> >
> >> Hi Filip,
> >> Thanks for your response.
> >> I can only reproduce it on production, where we are running a
> Linux 2.6
> >> Kernel with JDK 6 update 7. After a high load it is still
> running at 100%
> >> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
> >> Today I'll try to do some profiling to detect the exact cause,
> but the bug
> >>
> > I
> >
> >> mentioned before sound like a possible cause to me.
> >> I understand that you said that the bug is not fixed in JDK 6
> update 7?
> >> It's strange because here
> >> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says
> that the
> >>
> > bug
> >
> >> is fixed.
> >>
> >> Thanks,
> >> Matías
> >>
> >> -----Original Message-----
> >> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] >>
> Sent: martes, 14 de octubre de 2008 08:16 p.m.
> >> To: Tomcat Users List
> >> Subject: Re: NIO 100% CPU usage
> >>
> >> hi Matías,
> >>
> >> I have not yet found a way to reproduce it to put in a work
> around so >> even though its not fixed in 1.5 and 1.6, we can make
> it work.
> >> If you want to work with me, we can make that happen, assuming
> you have >> a way to reproduce this
> >>
> >> Filip
> >>
> >> Matías Rojas wrote:
> >>
> >>
> >>> Hello,
> >>>
> >>> I'm experiencing a problem with NIO in Tomcat, maybe related
> to this
> >>>
> >>>
> >> issue:
> >>
> >>
> >>>
> >>>
> >>> Selector doesn't block on Selector.select(timeout) (lnx) >>>
> >>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
> >>>
> >>>
> >>>
> >>> I'm using JDK 6 update 7 and it seems not to be fixed, does
> anybody have
> >>>
> >>>
> >> the
> >>
> >>
> >>> same problem?
> >>>
> >>> When in heavy load, CPU usage goes to 100% and the only way to
> go back to
> >>> normal is restarting Tomcat.
> >>>
> >>>
> >>>
> >>> Thanks,
> >>>
> >>> Matías
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> ---------------------------------------------------------------------
> >> To start a new topic, e-mail: users@tomcat.apache.org
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >>
> ---------------------------------------------------------------------
> >> To start a new topic, e-mail: users@tomcat.apache.org
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >>
> >>
> >
> >
> >
> ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> >
> ---------------------------------------------------------------------
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> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> >
>
>
> ---------------------------------------------------------------------
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
> ------------------------------------------------------------------------
>
>
---------------------------------------------------------------------
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Re: NIO 100% CPU usage
Posted by Rainer Jung <ra...@kippdata.de>.
Jerome Jar schrieb:
> Ronald,
>
> thread dumps contain the native ID of threads, and ps can output such IDs as
> well, so you can match the output together. Been there, done that.
L flag for ps shows all threads and contains thread numbers, usually
numerically starting above the PID, but IDs of threads generated much
later than the process might have higher offsets.
Java Thread Dump contains nid and tid. Depending on the platform and
JVM, one of the two is the Thread ID from ps, often in Hex.
Regards,
Rainer
> On Thu, Oct 16, 2008 at 7:16 PM, Ronald Klop <ro...@base.nl>wrote:
>
>> Filip,
>>
>> How do your top or ps commands relate to threads in the thread dump?
>> Are there shared ids or shared names in there?
>>
>> I'm searching for this for some time, so am really interested in what you
>> mean.
>>
>> Ronald.
---------------------------------------------------------------------
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Re: NIO 100% CPU usage
Posted by Jerome Jar <iu...@gmail.com>.
Ronald,
thread dumps contain the native ID of threads, and ps can output such IDs as
well, so you can match the output together. Been there, done that.
On Thu, Oct 16, 2008 at 7:16 PM, Ronald Klop <ro...@base.nl>wrote:
> Filip,
>
> How do your top or ps commands relate to threads in the thread dump?
> Are there shared ids or shared names in there?
>
> I'm searching for this for some time, so am really interested in what you
> mean.
>
> Ronald.
>
>
> Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List <
> users@tomcat.apache.org>:
>
>>
>>
>> Subject: Re: NIO 100% CPU usage
>> Date: Wed Oct 15 20:22:43 CEST 2008
>> From: Filip Hanik - Dev Lists <de...@hanik.com>
>>
>>
>>
>> ok, when you reproduce it, you don't really need a profiler,
>> you can do a top with threads on, or a ps -efL, and from those, you can
>> look into a thread dump
>>
>> I've never been able to reproduce the issue, so if you have a system, or
>> if you want to work with me, ping me offline at fhanik at apache dot org
>>
>> Filip
>>
>>
>> Matías Rojas wrote:
>> > It's 6.0.18
>> >
>> > -----Original Message-----
>> > From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] > Sent:
>> miércoles, 15 de octubre de 2008 07:25 p.m.
>> > To: Tomcat Users List
>> > Subject: Re: NIO 100% CPU usage
>> >
>> > what version of tomcat are you using?
>> >
>> > Filip
>> >
>> > Matías Rojas wrote:
>> > >> Hi Filip,
>> >> Thanks for your response.
>> >> I can only reproduce it on production, where we are running a Linux 2.6
>> >> Kernel with JDK 6 update 7. After a high load it is still running at
>> 100%
>> >> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
>> >> Today I'll try to do some profiling to detect the exact cause, but the
>> bug
>> >> > I
>> > >> mentioned before sound like a possible cause to me.
>> >> I understand that you said that the bug is not fixed in JDK 6 update 7?
>> >> It's strange because here
>> >> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that
>> the
>> >> > bug
>> > >> is fixed.
>> >>
>> >> Thanks,
>> >> Matías
>> >>
>> >> -----Original Message-----
>> >> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] >> Sent:
>> martes, 14 de octubre de 2008 08:16 p.m.
>> >> To: Tomcat Users List
>> >> Subject: Re: NIO 100% CPU usage
>> >>
>> >> hi Matías,
>> >>
>> >> I have not yet found a way to reproduce it to put in a work around so
>> >> even though its not fixed in 1.5 and 1.6, we can make it work.
>> >> If you want to work with me, we can make that happen, assuming you have
>> >> a way to reproduce this
>> >>
>> >> Filip
>> >>
>> >> Matías Rojas wrote:
>> >> >> >>> Hello,
>> >>>
>> >>> I'm experiencing a problem with NIO in Tomcat, maybe related to this
>> >>> >>> >> issue:
>> >> >> >>> >>>
>> >>> Selector doesn't block on Selector.select(timeout) (lnx) >>>
>> >>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
>> >>>
>> >>> >>>
>> >>> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody
>> have
>> >>> >>> >> the
>> >> >> >>> same problem?
>> >>>
>> >>> When in heavy load, CPU usage goes to 100% and the only way to go back
>> to
>> >>> normal is restarting Tomcat.
>> >>>
>> >>> >>>
>> >>> Thanks,
>> >>>
>> >>> Matías
>> >>>
>> >>>
>> >>> >>> >>> >>
>> ---------------------------------------------------------------------
>> >> To start a new topic, e-mail: users@tomcat.apache.org
>> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> >> For additional commands, e-mail: users-help@tomcat.apache.org
>> >>
>> >>
>> >> ---------------------------------------------------------------------
>> >> To start a new topic, e-mail: users@tomcat.apache.org
>> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> >> For additional commands, e-mail: users-help@tomcat.apache.org
>> >>
>> >>
>> >> >> >
>> >
>> > ---------------------------------------------------------------------
>> > To start a new topic, e-mail: users@tomcat.apache.org
>> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> > For additional commands, e-mail: users-help@tomcat.apache.org
>> >
>> >
>> > ---------------------------------------------------------------------
>> > To start a new topic, e-mail: users@tomcat.apache.org
>> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> > For additional commands, e-mail: users-help@tomcat.apache.org
>> >
>> >
>> >
>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>>
>
--
"Houston, we have a problem."
Re: NIO 100% CPU usage
Posted by Ronald Klop <ro...@base.nl>.
Filip,
How do your top or ps commands relate to threads in the thread dump?
Are there shared ids or shared names in there?
I'm searching for this for some time, so am really interested in what you mean.
Ronald.
Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List <us...@tomcat.apache.org>:
>
>
> Subject: Re: NIO 100% CPU usage
> Date: Wed Oct 15 20:22:43 CEST 2008
> From: Filip Hanik - Dev Lists <de...@hanik.com>
>
>
> ok, when you reproduce it, you don't really need a profiler,
> you can do a top with threads on, or a ps -efL, and from those, you can look into a thread dump
>
> I've never been able to reproduce the issue, so if you have a system, or if you want to work with me, ping me offline at fhanik at apache dot org
>
> Filip
>
>
> Matías Rojas wrote:
> > It's 6.0.18
> >
> > -----Original Message-----
> > From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] > Sent: miércoles, 15 de octubre de 2008 07:25 p.m.
> > To: Tomcat Users List
> > Subject: Re: NIO 100% CPU usage
> >
> > what version of tomcat are you using?
> >
> > Filip
> >
> > Matías Rojas wrote:
> >
> >> Hi Filip,
> >> Thanks for your response.
> >> I can only reproduce it on production, where we are running a Linux 2.6
> >> Kernel with JDK 6 update 7. After a high load it is still running at 100%
> >> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
> >> Today I'll try to do some profiling to detect the exact cause, but the bug
> >>
> > I
> >
> >> mentioned before sound like a possible cause to me.
> >> I understand that you said that the bug is not fixed in JDK 6 update 7?
> >> It's strange because here
> >> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the
> >>
> > bug
> >
> >> is fixed.
> >>
> >> Thanks,
> >> Matías
> >>
> >> -----Original Message-----
> >> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] >> Sent: martes, 14 de octubre de 2008 08:16 p.m.
> >> To: Tomcat Users List
> >> Subject: Re: NIO 100% CPU usage
> >>
> >> hi Matías,
> >>
> >> I have not yet found a way to reproduce it to put in a work around so >> even though its not fixed in 1.5 and 1.6, we can make it work.
> >> If you want to work with me, we can make that happen, assuming you have >> a way to reproduce this
> >>
> >> Filip
> >>
> >> Matías Rojas wrote:
> >>
> >>
> >>> Hello,
> >>>
> >>> I'm experiencing a problem with NIO in Tomcat, maybe related to this
> >>>
> >>>
> >> issue:
> >>
> >>
> >>>
> >>>
> >>> Selector doesn't block on Selector.select(timeout) (lnx) >>>
> >>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
> >>>
> >>>
> >>>
> >>> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have
> >>>
> >>>
> >> the
> >>
> >>
> >>> same problem?
> >>>
> >>> When in heavy load, CPU usage goes to 100% and the only way to go back to
> >>> normal is restarting Tomcat.
> >>>
> >>>
> >>>
> >>> Thanks,
> >>>
> >>> Matías
> >>>
> >>>
> >>>
> >>>
> >>>
> >> ---------------------------------------------------------------------
> >> To start a new topic, e-mail: users@tomcat.apache.org
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To start a new topic, e-mail: users@tomcat.apache.org
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >>
> >>
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> >
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
>
Re: NIO 100% CPU usage
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
ok, when you reproduce it, you don't really need a profiler,
you can do a top with threads on, or a ps -efL, and from those, you can
look into a thread dump
I've never been able to reproduce the issue, so if you have a system, or
if you want to work with me, ping me offline at fhanik at apache dot org
Filip
Matías Rojas wrote:
> It's 6.0.18
>
> -----Original Message-----
> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
> Sent: miércoles, 15 de octubre de 2008 07:25 p.m.
> To: Tomcat Users List
> Subject: Re: NIO 100% CPU usage
>
> what version of tomcat are you using?
>
> Filip
>
> Matías Rojas wrote:
>
>> Hi Filip,
>> Thanks for your response.
>> I can only reproduce it on production, where we are running a Linux 2.6
>> Kernel with JDK 6 update 7. After a high load it is still running at 100%
>> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
>> Today I'll try to do some profiling to detect the exact cause, but the bug
>>
> I
>
>> mentioned before sound like a possible cause to me.
>> I understand that you said that the bug is not fixed in JDK 6 update 7?
>> It's strange because here
>> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the
>>
> bug
>
>> is fixed.
>>
>> Thanks,
>> Matías
>>
>> -----Original Message-----
>> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
>> Sent: martes, 14 de octubre de 2008 08:16 p.m.
>> To: Tomcat Users List
>> Subject: Re: NIO 100% CPU usage
>>
>> hi Matías,
>>
>> I have not yet found a way to reproduce it to put in a work around so
>> even though its not fixed in 1.5 and 1.6, we can make it work.
>> If you want to work with me, we can make that happen, assuming you have
>> a way to reproduce this
>>
>> Filip
>>
>> Matías Rojas wrote:
>>
>>
>>> Hello,
>>>
>>> I'm experiencing a problem with NIO in Tomcat, maybe related to this
>>>
>>>
>> issue:
>>
>>
>>>
>>>
>>> Selector doesn't block on Selector.select(timeout) (lnx)
>>>
>>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
>>>
>>>
>>>
>>> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have
>>>
>>>
>> the
>>
>>
>>> same problem?
>>>
>>> When in heavy load, CPU usage goes to 100% and the only way to go back to
>>> normal is restarting Tomcat.
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Matías
>>>
>>>
>>>
>>>
>>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
---------------------------------------------------------------------
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RE: NIO 100% CPU usage
Posted by Matías Rojas <ro...@nimbuzz.com>.
It's 6.0.18
-----Original Message-----
From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
Sent: miércoles, 15 de octubre de 2008 07:25 p.m.
To: Tomcat Users List
Subject: Re: NIO 100% CPU usage
what version of tomcat are you using?
Filip
Matías Rojas wrote:
> Hi Filip,
> Thanks for your response.
> I can only reproduce it on production, where we are running a Linux 2.6
> Kernel with JDK 6 update 7. After a high load it is still running at 100%
> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
> Today I'll try to do some profiling to detect the exact cause, but the bug
I
> mentioned before sound like a possible cause to me.
> I understand that you said that the bug is not fixed in JDK 6 update 7?
> It's strange because here
> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the
bug
> is fixed.
>
> Thanks,
> Matías
>
> -----Original Message-----
> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
> Sent: martes, 14 de octubre de 2008 08:16 p.m.
> To: Tomcat Users List
> Subject: Re: NIO 100% CPU usage
>
> hi Matías,
>
> I have not yet found a way to reproduce it to put in a work around so
> even though its not fixed in 1.5 and 1.6, we can make it work.
> If you want to work with me, we can make that happen, assuming you have
> a way to reproduce this
>
> Filip
>
> Matías Rojas wrote:
>
>> Hello,
>>
>> I'm experiencing a problem with NIO in Tomcat, maybe related to this
>>
> issue:
>
>>
>>
>> Selector doesn't block on Selector.select(timeout) (lnx)
>>
>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
>>
>>
>>
>> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have
>>
> the
>
>> same problem?
>>
>> When in heavy load, CPU usage goes to 100% and the only way to go back to
>> normal is restarting Tomcat.
>>
>>
>>
>> Thanks,
>>
>> Matías
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
---------------------------------------------------------------------
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---------------------------------------------------------------------
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Re: NIO 100% CPU usage
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
what version of tomcat are you using?
Filip
Matías Rojas wrote:
> Hi Filip,
> Thanks for your response.
> I can only reproduce it on production, where we are running a Linux 2.6
> Kernel with JDK 6 update 7. After a high load it is still running at 100%
> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
> Today I'll try to do some profiling to detect the exact cause, but the bug I
> mentioned before sound like a possible cause to me.
> I understand that you said that the bug is not fixed in JDK 6 update 7?
> It's strange because here
> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug
> is fixed.
>
> Thanks,
> Matías
>
> -----Original Message-----
> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
> Sent: martes, 14 de octubre de 2008 08:16 p.m.
> To: Tomcat Users List
> Subject: Re: NIO 100% CPU usage
>
> hi Matías,
>
> I have not yet found a way to reproduce it to put in a work around so
> even though its not fixed in 1.5 and 1.6, we can make it work.
> If you want to work with me, we can make that happen, assuming you have
> a way to reproduce this
>
> Filip
>
> Matías Rojas wrote:
>
>> Hello,
>>
>> I'm experiencing a problem with NIO in Tomcat, maybe related to this
>>
> issue:
>
>>
>>
>> Selector doesn't block on Selector.select(timeout) (lnx)
>>
>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
>>
>>
>>
>> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have
>>
> the
>
>> same problem?
>>
>> When in heavy load, CPU usage goes to 100% and the only way to go back to
>> normal is restarting Tomcat.
>>
>>
>>
>> Thanks,
>>
>> Matías
>>
>>
>>
>>
>
>
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RE: NIO 100% CPU usage
Posted by Matías Rojas <ro...@nimbuzz.com>.
Hi Filip,
Thanks for your response.
I can only reproduce it on production, where we are running a Linux 2.6
Kernel with JDK 6 update 7. After a high load it is still running at 100%
CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
Today I'll try to do some profiling to detect the exact cause, but the bug I
mentioned before sound like a possible cause to me.
I understand that you said that the bug is not fixed in JDK 6 update 7?
It's strange because here
http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the bug
is fixed.
Thanks,
Matías
-----Original Message-----
From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
Sent: martes, 14 de octubre de 2008 08:16 p.m.
To: Tomcat Users List
Subject: Re: NIO 100% CPU usage
hi Matías,
I have not yet found a way to reproduce it to put in a work around so
even though its not fixed in 1.5 and 1.6, we can make it work.
If you want to work with me, we can make that happen, assuming you have
a way to reproduce this
Filip
Matías Rojas wrote:
> Hello,
>
> I'm experiencing a problem with NIO in Tomcat, maybe related to this
issue:
>
>
>
> Selector doesn't block on Selector.select(timeout) (lnx)
>
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
>
>
>
> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have
the
> same problem?
>
> When in heavy load, CPU usage goes to 100% and the only way to go back to
> normal is restarting Tomcat.
>
>
>
> Thanks,
>
> Matías
>
>
>
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Re: NIO 100% CPU usage
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
hi Matías,
I have not yet found a way to reproduce it to put in a work around so
even though its not fixed in 1.5 and 1.6, we can make it work.
If you want to work with me, we can make that happen, assuming you have
a way to reproduce this
Filip
Matías Rojas wrote:
> Hello,
>
> I'm experiencing a problem with NIO in Tomcat, maybe related to this issue:
>
>
>
> Selector doesn't block on Selector.select(timeout) (lnx)
>
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
>
>
>
> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have the
> same problem?
>
> When in heavy load, CPU usage goes to 100% and the only way to go back to
> normal is restarting Tomcat.
>
>
>
> Thanks,
>
> Matías
>
>
>
---------------------------------------------------------------------
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